gr-doa is a demonstration on the phase synchronization capability of Ettus Research's TwinRX daughtercards. TwinRX daughtercards can achieve a high degree of accurate phase synchronization except for constant repeatable relative phase offsets. We provide apps to determine the accuracy of phase synchronization achieved and to estimate DoA which fundamentally requires accurate phase synchronization across the receive streams.

• UHD >= 3.10.1.0
• gnuradio >= 3.7.10.1
• armadillo >= 7.300

• octave (Tested 4.0.2)
• octave-signal (Tested 1.3.2)
• scipy (Tested 0.15.1)
• oct2py (Tested 3.5.9)

• texlive-latex-base

• A wrapper to the USRP source block when using an X310 with 1 or 2 TwinRXs
• Relative phase offset measurement and correction
• Antenna element calibration for linear arrays
• MUSIC algorithm for linear arrays
• Root-MUSIC algorithm for linear arrays

• Ubuntu 14.04, Ubuntu 16.04

$ git clone https://github.com/EttusResearch/gr-doa
$ cd gr-doa
$ mkdir build
$ cd build
$ cmake ..
$ make
$ make test
$ sudo make install
$ sudo ldconfig

• For a concise description of the steps involved: https://github.com/EttusResearch/gr-doa/wiki
• For details about the blocks available in this package: gr-doa/build/docs/doxygen/html/index.html
• For detailed description: gr-doa/docs/whitepaper/doa_whitepaper.pdf